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A hearing aid is a small electrical machine which fits in or behind a person's ear. The purpose of a hearing aid is to make sounds louder so the deaf person can hear spoken words and other sounds.
The two most common types of modern hearing aids are behind the ear aids and in the ear aids.
Before hearing aids were invented, people used "ear trumpets" also called ear horns.[1][2]
- ↑ Comparison of Hearing Aids Over the 20th Century. Ear & Hearing. 21(6):625-639, December 2000. Bentler, Ruth A.; Duve, and Monica R.
- ↑ http://www.hearingcenter.com/Questions/Q_ear-horn.html Archived 2008-07-24 at the Wayback Machine Ear Horn Q&A. Accessed 6 Dec 2007.